/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.streaming.connectors.kafka.testutils;

import org.apache.flink.api.common.functions.MapFunction;

/**
 * An identity map function that sleeps between elements, throttling the
 * processing speed.
 *
 * @param <T> The type mapped.
 */
public class ThrottledMapper<T> implements MapFunction<T, T> {

	private static final long serialVersionUID = 467008933767159126L;

	private final int sleep;

	public ThrottledMapper(int sleep) {
		this.sleep = sleep;
	}

	@Override
	public T map(T value) throws Exception {
		Thread.sleep(this.sleep);
		return value;
	}
}
